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    <script>
        // flat 平
        // 将多维数组转化为低维数组
        // const arr = [1,2,3,4,[5,6]]
        // const arr = [1,2,3,4,[5,6,[7,8,9]]]
        // 参数为深度 是一个数字
        // console.log(arr.flat(2));

        // flatMap
        const arr = [1,2,3,4]
        const result = arr.flatMap(item => [item * 10])

        console.log(result);
    </script>
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